https://issues.liferay.com/browse/LRDOCS-364

https://issues.liferay.com/browse/LRDOCS-364

Created a target in liferay-docs that invokes conversion on the desired properties files, creates an index HTML file listing the properties file with links to them, and places the index HTML and the properties HTML files in a single directory for easy upload to docs.liferay.com

@jhinkey